LUKS disk encryption with remote boot authentication

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Hello,

I'm interested in a solution for devices with LUKS disk encryption
that use a remote server to securely obtain a decryption key upon
boot. Let me elaborate: Suppose I have an embedded device i.e.
Raspberry Pi with an external USB HDD or maybe a Cubieboard with a
SATA-attached disk. The rootfs is located on an encrypted partition on
the disk that has to be decrypted before the OS can boot. The boot
partition is located on an unencrypted NAND/SD partition.

Normally a modern linux distro will ask the user to type in the
password via a keyboard upon boot, if disk encryption is being used. I
am however interested in setups where this decryption key is obtained
securely (TLS?) from a remote (secure) server via LAN.

Are there any known setups like this that I can take a look at?

Kind regards!
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